Is this person dangerous or threatening? If so you could meet with the police, give them a heads up and ask for extra patrols in your neighborhood. Be on guard

Is this person dangerous or threatening? If so you could meet with the police, give them a heads up and ask for extra patrols in your neighborhood. Be on guard when you're leaving coming home any place you're alone. Resetting all passwords is a good idea, enable 2 factor auth. I would leave your existing home router up as a distraction, purchase a new one with new generic ssid and strong password and use that one. You could also try using personal hot spot for a week depending on how much bandwidth you use. If you don't think they are a threat just snooping to make chance encounters happen. You could try setting up honey pot plans one by one (gCal, email, sms, from laptop, from phone browser, etc) to try to see if there is a pattern to how they are tracking you. Swap phones with a friend for an afternoon with someone that knows them or what they look like, see if they run in to them. They could be in to any or everything though digitally. Or maybe nothing and they just know places you go so they go there often to increase chance meetings. Try to distance your self from them, give them the cold shoulder when you do run in to each other, maybe they'll be the hint. Good luck, be safe.